kuassel: refactiring

Here is a short list of what exactly changed:
 - made it run only single instance via KUniqueApplication
 - make it store config and data in KDE directories
 - added irc protocol service provider files for use in KDE
 - removed Dock and Phonon notification support
 - removed Web links preview support
 - rebranded (incomplete, but mostly done)

Things that need doing:
 - use KDE localiztion implementation
 - the --url argument needed for the service does not actually join
 - use KStyle instead of stylesheets?
 - implement a help menu like other KDE apps
 - integrate with various KDE parts?